A binary solvent system for improved liquid phase exfoliation of pristine graphene materials

Chen, Jianping; Shi, Weili; Dong, Fang; Wang, Tao; Huang, Jing; Li, Qi; Jiang, Ming; Liu, Lei; Li, Qiong; Dong, Lijie; Wang, Qing; Xiong, Chuanxi

doi:10.1016/j.carbon.2015.07.006

Cited by 36 publications

(25 citation statements)

References 39 publications

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“…As shown in Table 2 , surface tension of DMSO (41.1 mJ m −2 ), DMF (37.1 mJ m −2 ), and NMP (40 mJ m −2 ) were close to that of MoS 2 (44 mJ m −2 ) 23–25. In addition, DMF would more likely be attached to 2D materials surface 14. Given high concentration dispersions (or high solubility), strong interaction, easier adsorption, and difficulty in completely removing residual NMP,14,22,23 the amount of residual molecules (DMSO, DMF, and NMP) on MoS 2 after immersion treatment is greater than the amount when surface energy mismatches.…”

Section: Charge Density and Carrier Mobility Before And After Dopingmentioning

confidence: 61%

“…In this way, the accumulated charge density on oxygen from the carbonyl group increases the electron donating characteristics of the amide carbonyl group 12,13. Previous studies also indicated DMF and NMP can act as electron donor to graphene 14. Therefore, NMP can transfer electron to MoS 2 forming n‐type doping when absorbed on MoS 2 surface, and transfer direction corresponds to red arrows shown in Figure 2b.…”

Section: Charge Density and Carrier Mobility Before And After Dopingmentioning

confidence: 87%

“…In addition, DMF would more likely be attached to 2D materials surface 14. Given high concentration dispersions (or high solubility), strong interaction, easier adsorption, and difficulty in completely removing residual NMP,14,22,23 the amount of residual molecules (DMSO, DMF, and NMP) on MoS 2 after immersion treatment is greater than the amount when surface energy mismatches. Due to more residual molecules and stronger interactions, these solvents with matched surface energy contributed to surface charge transfer, eventually impacting electrical results of MoS 2 .…”

Section: Charge Density and Carrier Mobility Before And After Dopingmentioning

confidence: 99%

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Controllable Doping of Transition‐Metal Dichalcogenides by Organic Solvents

Sun

Guo

et al. 2020

Adv Elect Materials

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Seeking controllable and efficient surface dopant molecules for transition‐metal dichalcogenides (TMDCs) is highly valuable for fully understanding TMDCs properties and their applications to relevant devices. The general doping effect of solvents on TMDCs are explored. By selecting suitable solvents with optimized relevant factors, controllable n‐doping of molybdenum disulfide (MoS2) is obtained on the same device with the sheet density of electrons increased from 2.3 × 1011 to 6.4 × 1012, 9.7 × 1012, and 1.6 × 1013 by use of dimethylsulfoxide, N,N‐dimethylformamide, and N‐methyl‐pyrrolidone (NMP), respectively. The doping principle is explained by charge‐donating characteristics of molecule and dipole interaction. After doping by NMP, the contact resistance is reduced by four times, and the on/off current ratio of fabricated top‐gated MoS2 transistors is increased by 3 orders of magnitude. This work can guide the selection of suitable solvents for effective doping of two‐dimensional materials and advance the development of precise controllable electronic and optoelectronic devices.

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Section: Charge Density and Carrier Mobility Before And After Dopingmentioning

confidence: 61%

Section: Charge Density and Carrier Mobility Before And After Dopingmentioning

confidence: 87%

Section: Charge Density and Carrier Mobility Before And After Dopingmentioning

confidence: 99%

See 1 more Smart Citation

Controllable Doping of Transition‐Metal Dichalcogenides by Organic Solvents

Sun

Guo

et al. 2020

Adv Elect Materials

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“…Chen and co‐workers reported that a solvent system of dimethylformamide and n ‐butylalcohol can efficiently promote the exfoliation . Each dimethylformamide molecule could assemble with three n ‐butylalcohol molecules by hydrogen bonding to form a molecular hybrid.…”

Section: Processing Graphenementioning

confidence: 99%

Graphene Platelets and Their Polymer Composites: Fabrication, Structure, Properties, and Applications

Shi

Araby

Gibson

et al. 2018

Adv Funct Materials

208

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Graphene oxide is extensively compounded with polymers toward a wide variety of applications. Less studied are few-layer or multi-layer highly crystalline graphene, both of which are herein named as graphene platelets. This article aims to provide the most recent advancements of graphene platelets and their polymer composites. A first focus lies on cost-effective fabrication strategies of graphene platelets -intercalation and exfoliation -which work in a relative mass scale, e.g., 5.3 g h −1 . As no heavy oxidization is involved, the platelets have high crystalline integrity, e.g., C:O ratio over 8.0, with thicknesses 2-4 nm and lateral dimension up to a few micrometers. Through carefully selecting the solvent for dispersion and the molecules for surface modification, graphene platelets can be liquid-processable, enabling them to be printed, coated, or compounded with various polymers. A purposedesigned experiment is undertaken to unravel the effect of reasonable ultrasonication time on the platelet thickness. Typical polymer/graphene platelet composites are critically examined for their preparation, structure, and applications such as thermal management and flexible/stretchable electronic devices. Perspectives on the limitations, current challenges, and future prospects for graphene platelets and their polymer composites are provided.

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“…随后Chia等 [30] 研究了在不同体积混合比的乙醇-水混合物中原始石墨的剥离, 发现乙醇含量为 4 0 % 时剥离效果最佳 , 得到高达 1 mg mL −1 的石墨烯分散液. Chen等 [31] [32] 提出在有机盐辅助下, 在普通有机溶剂中高效剥离原始石墨的途径, 发现加入助剂辅助剥离得到的石墨烯分散液浓度与纯溶剂相比均有提高. 特别是在二甲基亚砜(DMSO)溶剂中, 加入有机盐助剂剥离效率会显著提高 [32] .…”

Section: 传统的剥离溶剂是从有机溶剂开始的自2009年unclassified

Application of ionic liquids on green exfoliation preparation of graphene in large scale

Wu¹,

Yan²

2018

Sci. Sin.-Chim

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The preparation of supported ionic liquids (SILs) and their application in rare metals separation SCIENCE CHINA Chemistry 55, 1479 (2012); a novel family of green ionic liquids with surface activities Science in China Series B-Chemistry 50, 238 (2007); Research progress in preparation of graphene and its composites based on ionic liquids SCIENTIA SINICA Chimica 46, 1277 (2016); Ionic liquids as green reaction media for synthesis of poly(aryl ether ketone)s

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A binary solvent system for improved liquid phase exfoliation of pristine graphene materials

Cited by 36 publications

References 39 publications

Controllable Doping of Transition‐Metal Dichalcogenides by Organic Solvents

Controllable Doping of Transition‐Metal Dichalcogenides by Organic Solvents

Graphene Platelets and Their Polymer Composites: Fabrication, Structure, Properties, and Applications

Application of ionic liquids on green exfoliation preparation of graphene in large scale

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